When I mounted my beloved Sigma 35mm f/1.4 ART to EOS RP, it shocked me with two black circles on screen and the actual taken photos. I remembered someone asked this question in a forum about EOS-M and Sigma lenses. The problem causing this was Canon's software lens correction feature. If you had the same "shocking" issue and Google brought you here, you can follow the steps below to fix it.
Raymond
www.raymondleung.ca
